This is just a modpack for 1.7.2 and above. It may work on 1.6.4, but (WARNING!) It is not my fault of what happens to you, your account, or your folders. Lastly, HAVE FUN! :) (THIS MODPACK IS A WORK IN PROGRESS, DO NOT USE)
Installing a modpack using the Technic Launcher is easy. If you don't already have the launcher downloaded, visit our download page to get the latest version.
Type in the modpack name (RSUS Shaders Mod for 1.7.2+) or paste the following url into the search box.
Finally, click Install at the bottom right of the launcher after you select RSUS Shaders Mod for 1.7.2+ from the list on the left. The launcher will handle everything else!